CN108071538A - For supplying fuel, preferably diesel fuel to the pump group part of internal combustion engine - Google Patents

For supplying fuel, preferably diesel fuel to the pump group part of internal combustion engine Download PDF

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Publication number
CN108071538A
CN108071538A CN201711123946.7A CN201711123946A CN108071538A CN 108071538 A CN108071538 A CN 108071538A CN 201711123946 A CN201711123946 A CN 201711123946A CN 108071538 A CN108071538 A CN 108071538A
Authority
CN
China
Prior art keywords
blocking piece
surrounding wall
group part
pump
pump head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201711123946.7A
Other languages
Chinese (zh)
Other versions
CN108071538B (en
Inventor
L·莫斯卡雷拉
B·洛亚科诺
V·C·贝尔焦维内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of CN108071538A publication Critical patent/CN108071538A/en
Application granted granted Critical
Publication of CN108071538B publication Critical patent/CN108071538B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing
    • F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/48—Assembling; Disassembling; Replacing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0448—Sealing means, e.g. for shafts or housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/22—Arrangements for enabling ready assembly or disassembly
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/14—Cap nuts; Nut caps or bolt caps
    • F16B37/145—Sleeve nuts, e.g. combined with bolts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/05—Fuel-injection apparatus having means for preventing corrosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/855—Mounting of fuel injection apparatus using clamp elements or fastening means, e.g. bolts or screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

A kind of pump group part, for delivering fuel to internal combustion engine；The pump group part (1) includes：Pump head (2) is formed in for accommodating the cylinder of slidingtype pumping piston (3) in the pump head；The through hole (4) extended from cylinder (3) to the outside of pump head (2)；It is coupled to the blocking piece (5) of pump head (2), the sucking room (6) that the blocking piece is connected for restriction by hole (4) with cylinder (3)；Wherein, the coupling between blocking piece (5) and pump head (2) be the surrounding wall (7) of pump head (2) outer surface (8) and blocking piece (5) surrounding wall (9) inner surface (10) between screw thread couple；Wherein, the surrounding wall (9) of blocking piece (5) includes the lower edge (12) for being provided with the inclined surface (13) for being connected to inner surface (10)；Wherein, the projection (H) of the edge of inclined surface (13) plane orthogonal with inner surface (10) is less than twice of the height (h) of the screw thread of blocking piece (5).

Description

For supplying fuel, preferably diesel fuel to the pump group part of internal combustion engine
Technical field
It is used to supply fuel, preferably diesel fuel to the pump group part of internal combustion engine the present invention relates to a kind of.
Background technology
Particularly, the present invention relates to the pump of following types, including for delivering fuel to the height of internal combustion engine Press pump pumps in this example for piston pump and for being supplied fuel to the low pressure of piston pump or pre-feed from reservoir.
More particularly it relates to screw thread couplings the pump head of pump is attached to it is relevant lid for close into Expect the region of room, the region is exposed to air and ambient enviroment.
It is well known that piston pump includes the pump housing, at least one pump head is mounted on the pump housing.Pump head, which has, is formed in it Internal cylinder, pumping piston are slidably engaged in the cylinder.Actuation means, such as camshaft are arranged to incite somebody to action Induction stroke in fuel suction cylinder and the compression stroke of the fuel for compressed container in the cylinder move piston.
Cylinder opens wide in the region in hole at top, and the discharge chambe at cylinder top is connected to fuel and sucked by the hole Room.Particularly, sucking room is supplied by supply pipe, and by pump head gauge on one side, on another side by sealing closing blocking piece limit Boundary.
Sucking room is connected to cylinder by means of induction valve.
Blocking piece is coupled to pump head by means of screw thread couplings.Particularly, pump head includes the wall protruded outward, and the wall is equipped with The thread outer surface coupled with the respective threaded inner surface of the circle segment of blocking piece.Blocking piece is formed as including top section parallel connection It is connected to the integral piece of above-mentioned circle segment or may include the lid being held in place by collar nut.In the latter case, ring Shape nut is used as the circle segment with thread inner surface of blocking piece, and the thread inner surface is for the spiral shell with the surrounding wall of pump head Line outer surface couples.
As it is known, the part towards pump head of the low portion of screw thread couplings, i.e. screw thread couplings is freely Exposed to the external environment of surrounding, surrounding wall is protruded from the pump head.
If there are water droplet on pump head, under given conditions therefore water droplet may reach the exposure of screw thread couplings Low portion.Particularly when pumping compared with vertical direction to install " strongly ", it may occur however that this feelings inclination Condition, " strongly " gradient are conducive to the low portion for spontaneously by means of gravity water being made just to accumulate in screw thread couplings The external environment exposed to surrounding region in.
As it is known, due to machinery, either in the form of collar nut or with the surrounding wall of lid Form realizes, the low portion of the surrounding wall of blocking piece, which all has, is being internally provided with the lower edge of lower surface, and the following table is towards pump The direction of the surrounding wall of head is inclined upwardly.
In other words, the inner surface and the outer surface of the surrounding wall of blocking piece is not by orthogonal with the surrounding wall of pump head single Lower edge links together.The inclined lower surface is designed to provide receiving portion, for correctly rotary screwing thread table Face, otherwise thread surface may block and hinder correctly to screw.
In fact, similar inclined surface is also formed on the outer lower part of the surrounding wall of pump head, and have from top Gradient under portion's direction is interpreted as being directed toward downwards the direction of pump head.
Although the sloping portion of the lower edge of the surrounding wall of blocking piece therefore for by blocking piece be coupled to pump head be it is necessary and Useful, but so cavity is formd between the surrounding wall of blocking piece and the surrounding wall of pump head.
Therefore, unfortunately, not only the low portion of screw thread couplings is exposed to water droplet naturally, but also herein just at this Potential ponding room is formed locally in region.
At present, above-mentioned inclined surface extends approximately along the whole length of the lower edge of the surrounding wall of blocking piece, thus stifled The big chamber of potential water accumulation is formed in the exposed region of screw thread couplings between part and pump head.
Between being formed in two steels due to the screw thread couplings, the presence of water can cause not only in couplings Outside but also inside formed corrosion, so as to weaken the screw thread couplings.
The content of the invention
Based on this known technology, it is used to fire fuel, preferably diesel oil it is an object of the present invention to provide one kind To the pump group part of the replacement of internal combustion engine, the pump group part do not have disadvantages mentioned above and is simple to manufacture and of low cost for material supply.
Particularly, it is an object of the present invention to provide a kind of for sucking the blocking piece of room, on the one hand the blocking piece makes Can correctly screw to pump head, on the other hand can be avoided as much as or limit water droplet accumulate in blocking piece and pump head it Between screw thread couplings the low portion exposed to air on, and therefore prevent from forming local corrosion.
According to the present invention, a kind of pump group part is provided, is used to supply fuel, preferably diesel fuel to internal combustion engine, Wherein, the pump group part includes：
- pump head, the cylinder for accommodating slidingtype pumping piston are formed in the pump head；
- the through hole extended from cylinder to the outside of pump head；
- with hole relatively it is coupled to the blocking piece of pump head, the blocking piece is for limiting the sucking room connected by hole with cylinder；Its In,
- the coupling between blocking piece and pump head be the surrounding wall of pump head thread outer surface and blocking piece surrounding wall screw thread in Screw thread coupling between surface；
The surrounding wall of-blocking piece includes the lower edge for being provided with inclined surface, and the inclined surface is used to couple and be connected to The inner surface of the surrounding wall of blocking piece；
The projection of the edge of-inclined surface plane orthogonal with the inner surface of the surrounding wall of blocking piece is less than the surrounding wall of blocking piece Twice of the height of the screw thread of inner surface.
Represent that the wall for limiting " inside " is in the axis vertical take-off with pump on the term " inside " of sucking room and " outside " Near the wall of sucking room on direction.
Term " under " and " on " with reference to the bottom of pump head, for prolonging with the surrounding wall that blocking piece couples since the bottom It stretches.Therefore, " under " wall or " under " portion be with pump head be used for blocking piece coupling surrounding wall start stretch out bottom it is immediate Wall or part.
According to the above, it is contemplated by the invention that the inclined surface of the lower edge of the surrounding wall of blocking piece along the axis with pump The projection of orthogonal plane is less than twice of the height of screw thread present on the inner surface of the surrounding wall of blocking piece.
In this way, when blocking piece is threaded on pump head, form exposed to air and can water accumulation chamber Room, the size of the chamber are greatly reduced and are less than the chamber of the prior art.In the case where local ponding is less, reduce or Completely eliminate the risk that corrosion is formed in the region of the screw thread couplings between blocking piece and pump head.When pump is spontaneously can to accumulate water Gather when the indoor strong gradient of the chamber is installed, this solution is very favorable.
Particularly, the projection of the orthogonal plane of the inner surface of the surrounding wall on the edge and wall of inclined surface surrounding less than blocking piece The 1/3 of the thickness of wall.
In this way, any drop occurred on the lower edge of blocking piece all must comply with before inclined surface is reached Long travel path, therefore more likely these drops can not reach the end of the travel path.
Particularly, blocking piece is included for securing the cap to the collar nut on pump head, and the inner surface of the surrounding wall of blocking piece exists In this case it is the inner surface of collar nut.
In this way, it is can also be applied to being fabricated to two individually blocking pieces of lid and collar nut component, Design without changing lid, it is only necessary to change the lower edge of collar nut.
Particularly, the lower edge of the surrounding wall of blocking piece includes lower surface, and the lower surface is connected to the lower end of inclined surface. The lower surface has the spiral shell of at least inner surface of the surrounding wall of blocking piece along the plane orthogonal with the inner surface of the surrounding wall of blocking piece Twice of scale of the height of line.
In this way, the only a fraction of in drop present on the lower edge of the surrounding wall of blocking piece can receive in place In chamber between the outer surface of the surrounding wall of the inner surface and pump head of the surrounding wall of blocking piece.
Particularly, lower surface is substantially orthogonal with inner surface.
In this way, at least in the case of the axis vertical of pump, lower surface will not be by water to the ring positioned at blocking piece Chamber conveying between the outer surface of the annular wall of the inner surface and pump head of wall.
Particularly, the surface roughness of lower surface is designed to be able to stop that water droplet leads to inclined surface on the lower surface.
In this way, it is angled such that the water droplet passed through on the lower surface is pushed to naturally by means of gravity in pump Also water can be avoided to accumulate in the exposed region of screw thread couplings during the region.
Particularly, the lower edge of the surrounding wall of blocking piece includes connection between the lower surface of the surrounding wall of blocking piece and outer surface Surface, wherein, which can be round as a ball or inclined, to be limited using inclined inner surface and lower surface Determine the trapezoidal profile of the lower edge of the surrounding wall of blocking piece.
In this way, at least under some heeling conditions of pump, drop present on connection surface is directed toward blocking piece The outer surface of surrounding wall.
Particularly, lower surface is tilted compared with the direction orthogonal with inner surface, to limit blocking piece using inclined surface The V-arrangement profile of the lower edge of surrounding wall.
In this way, under some heeling conditions of pump, drop present on lower surface is directed to V-arrangement profile Vertex, so that drop is separated with lower edge, and under other heeling conditions of pump, drop present on lower surface is directed toward blocking piece Surrounding wall outer surface.
Description of the drawings
Referring to the drawings, other feature and advantage of the invention will be from the following non-limiting example to the embodiment of the present invention Description in be apparent from, in attached drawing：
Fig. 1 is for the schematic sectional of the exemplary embodiment of the collar nut of the blocking piece of pump group part according to the present invention Figure；
Fig. 2 is the enlarged view according to the details of the lower edge of the collar nut of Fig. 1；
Fig. 3 is the enlarged view according to the pump group part equipped with collar nut in obliquity of Fig. 4；And
Fig. 4 be Fig. 3 in the screw thread couplings between collar nut and pump head exposed in the region of air The enlarged view of details.
Specific embodiment
With reference to Fig. 3,1 integrally represents to supply fuel, preferably diesel fuel to the pump of internal combustion engine (not shown) Component.
Pump group part 1 generally comprises high-pressure pump and unshowned such as gear class with pumping piston (partlying show) Pre-feed pump, the pumping piston is designed to be able to deliver fuel to internal combustion engine (not shown), the pre-feed pump design Into high-pressure pump can be delivered fuel to.High-pressure pump and gear pump are by axis driving (not shown in figures).
Pump 1 includes pump housing (not shown) and the pump head 2 fitted together with the pump housing.Cylinder 3 is formed in pump head 2 and along axis A1 extends.Pumping piston (not shown) extends along axis A1 and is slidably coupled to cylinder 3.Suction line 16 is laterally formed in In pump head 2, for being fed partly to accommodate the sucking room 6 of induction valve (not shown), the induction valve is used to control from suction Enter the room 6 arrive cylinder 3 The fuel stream.
The upper part of cylinder 3 limits discharge chambe, and the discharge chambe is connected in one side with sucking room 16, and laterally with conveying Pipe 17 connects.
Pump head 2 has the through hole 4 along axis A1, and one end of cylinder 3 is connected to sucking room 6 by the through hole 4.Particularly, Hole 4 extends from cylinder 3 to the outside of pump head 2.In more detail, hole 4 extends to discharge chambe from sucking room 6 in pump head 2 and accommodates A part for induction valve.
Pumping piston is by actuation means (not shown in attached drawing) along cylinder 3 with by including for will be in fuel suction cylinder 3 Fuel induction stroke and fuel for compressed container in the cylinder 3 stroke linear reciprocating motion displacement, to press Contracting compresses indoor fuel from the sucking of sucking room.
Room 16 is sucked on one side by 2 gauge of pump head, and on another side by 5 gauge of blocking piece.Particularly, blocking piece 5 and hole 4 Pump head 2 is relatively coupled on the opposite side compared with pumping piston.Blocking piece 5 is shown in the form of collar nut 18 in figure 3 It shows to meaning property, the collar nut 18 is acted on lid (not shown), and the lid is fixed on pump head 2.According to one Alternate embodiment, collar nut and lid can also be integral type elements.
Collar nut 18 is illustrated as separating with pump head in Fig. 1, and the lower edge of collar nut is in fig. 2 with exemplary form It shows.
Collar nut 18 is coupled along the thread outer surface 8 of the surrounding wall 7 protruded from pump head 2.The interior table of collar nut 18 Face 10 also has screw thread so that blocking piece 5, the in the example shown coupling between collar nut 18 and pump head 2 are by by pump head 2 The thread outer surface 8 of surrounding wall 7 couple with the inner surface 10 of collar nut 18 and threadingly perform.
The surrounding wall 9 of collar nut 18 includes lower edge 12, wherein " under " be understood to mean that close to the bottom of pump head 2, The lower edge is used as the lower connecting portion between the inner wall 10 of collar nut 18 and outer wall 11.
Particularly, lower edge 12 includes the inclined surface 13 being connected with the inner surface 10 of collar nut 18.Such as Fig. 3 and figure Shown in the enlarged drawing of 2 and Fig. 4, the lower edge 12 of surrounding wall 9 is exposed to air and usually sudden and violent particularly along inclined surface 13 Reveal to ambient enviroment.Therefore, the lower area of the screw thread couplings between collar nut 18 and pump head 2 so that exposed to air and Ambient enviroment.As shown in figure 3, pump 1 may be assembled so that the axis A1 of the pumping installations not vertical curve with being limited by gravity sometimes Alignment, but with gradient.In this case, the value of gradient may so that any water droplet is all present on lower edge 12 Spontaneously tend to be led to inclined surface 13 by means of gravity, and accumulate in the ring for being included in the inclined surface 13 and pump head 2 The interior formed between the outer surface of wall 78, the screw thread couplings i.e. between blocking piece 5 and pump head 2 expose portion in.
Water just excessive buildup in this region as illustrated in fig. 4 in order to prevent, the edge of inclined surface 13 and collar nut The projection H of the orthogonal plane of 18 inner surface 10 is less than twice of the height h of the screw thread of the collar nut 18.This necessarily causes The ponding room being possibly formed between the outer surface 8 of the surrounding wall 7 of the inclined surface 13 and pump head 2, which has, is less than collar nut 18 Screw thread height h entrance.Due to these geometric proportions, prevent from allowing the water to the accumulation into the water of screw thread couplings, And therefore prevent the local corrosion being likely to form.
The lower edge 12 of collar nut 18 include lower surface 14, the lower surface be connected to the lower end of inclined surface 13 and It is orthogonal with the inner surface 10 of the collar nut 18.
The length L of the edge of the lower surface 14 plane orthogonal with the surrounding wall 9 of collar nut 18 is the collar nut 18 Screw thread height h at least twice.
The surface roughness (not shown) of the lower surface 14 can be used for stopping that water droplet leads to inclined surface 13 and screw thread coupling The exposed region in portion.
From Fig. 4 or Fig. 2 as can be seen that on the opposite side compared with inclined surface 13, lower edge 12 includes round as a ball Lower surface 14 is attached to the outer surface 11 of collar nut 18 by connection surface 15, the connection surface.Alternatively, the connection surface 15 can also be linear inclined surface, to form the lower edge 12 with trapezoidal profile.
According to unshowned another embodiment, lower edge 12 can shape as V-arrangement, wherein, the inner arm of screw thread couplings is by inclining Skewed surface 13 is formed, and lower edge 12 is connected to the outer surface of collar nut 11 by outer arm.
Obviously, invention described herein can be subjected to modifications and variations, without departing from the protection domain of appended claims.

Claims (10)

1. a kind of pump group part is used to supply fuel, preferably diesel fuel to internal combustion engine；The pump group part (1) includes：
- pump head (2) is formed in for accommodating the cylinder of slidingtype pumping piston (3) in the pump head；
- the through hole (4) extended from cylinder (3) to the outside of pump head (2)；
- with hole (4) blocking pieces (5) of pump head (2) being relatively coupled to, the blocking piece is connected for limiting by hole (4) with cylinder (3) Sucking room (6)；
Wherein, the coupling between blocking piece (5) and pump head (2) is the thread outer surface (8) and blocking piece of the surrounding wall (7) of pump head (2) (5) the screw thread coupling between the thread inner surface (10) of surrounding wall (9)；
Wherein, the surrounding wall (9) of blocking piece (5) includes the lower edge (12) for being provided with inclined surface (13), and the inclined surface is used In being connected to inner surface (10)；
Wherein, the projection (H) of the edge of inclined surface (13) plane orthogonal with the inner surface (10) of the surrounding wall (9) of blocking piece (5) Less than twice of the height (h) of the screw thread of blocking piece (5).
2. pump group part as described in claim 1, which is characterized in that the edge of inclined surface (13) and the surrounding wall (9) of blocking piece (5) The projection (H) of the orthogonal plane of inner surface (10) be less than 1.5 times of height (h) of screw thread of blocking piece (5).
3. pump group part as described in claim 1, which is characterized in that the edge of inclined surface (13) and the surrounding wall (9) of blocking piece (5) The orthogonal plane of inner surface (10) projection (H) be less than blocking piece (5) surrounding wall (9) thickness (S) 1/3.
4. pump group part according to any one of the preceding claims, which is characterized in that blocking piece (5) includes that fixation will be covered To the collar nut (18) of pump head (2), the inner surface (10) of the surrounding wall (9) of blocking piece (5) is the inner surface of collar nut (18) (10)。
5. pump group part according to any one of the preceding claims, which is characterized in that under the surrounding wall (9) of blocking piece (5) Edge (12) includes lower surface (14), and the lower surface (14) is connected to the lower edge of inclined surface (13)；Lower surface (14) The length (L) of the plane orthogonal along the inner surface (10) of the surrounding wall (9) with blocking piece (5) is the height of the screw thread of blocking piece (5) (h) at least twice.
6. pump group part according to claim 5, which is characterized in that lower surface (14) are interior with the surrounding wall (9) of blocking piece (5) Surface (10) is substantially orthogonal.
7. such as pump group part described in claim 5 or 6, which is characterized in that the surface roughness of lower surface (14) can stop water The inclined surface (13) of the lower edge (12) for the surrounding wall (9) for leading to blocking piece (5) is dropped on lower surface (14).
8. according to the pump group part described in claim 5,6 or 7, which is characterized in that the lower edge of the surrounding wall (9) of blocking piece (5) (12) round as a ball connection surface (15) is included between lower surface (14) and outer surface (11).
9. according to the pump group part described in claim 5,6 or 7, which is characterized in that the lower edge of the surrounding wall (9) of blocking piece (5) (12) inclined connection surface is included between lower surface (14) and outer surface (11), the connection surface is configured to and nauropemeter Face (13) and lower surface (14) limit the trapezoidal profile of the lower edge (12) of the surrounding wall (9) of blocking piece (5) together.
10. pump group part as claimed in claim 5, which is characterized in that lower surface (14) are compared with the surrounding wall with blocking piece (5) (9) the orthogonal direction of inner surface (10) tilts, to limit the surrounding wall (9) of blocking piece (5) together with inclined surface (13) The V-arrangement profile of lower edge (12).
CN201711123946.7A 2016-11-14 2017-11-14 Pump assembly for supplying fuel, preferably diesel fuel, to an internal combustion engine Active CN108071538B (en)

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IT102016000114815 2016-11-14
IT102016000114815A IT201600114815A1 (en) 2016-11-14 2016-11-14 PUMP ASSEMBLY TO SUPPLY FUEL, PREFERABLY GASOIL, TO AN INTERNAL COMBUSTION ENGINE

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JP2010121452A (en) * 2008-11-17 2010-06-03 Bosch Corp Fuel supply pump
CN103097715A (en) * 2011-09-06 2013-05-08 丰田自动车株式会社 Fuel pump, and fuel supply system for internal combustion engine
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US20150132165A1 (en) * 2013-11-12 2015-05-14 Denso Corporation High-pressure pump
CN105593510A (en) * 2013-07-26 2016-05-18 德尔福国际运营卢森堡有限公司 High pressure pump
WO2016102138A1 (en) * 2014-12-24 2016-06-30 Robert Bosch Gmbh Pump unit for feeding fuel, preferably diesel fuel, to an internal combustion engine
EP3061967A1 (en) * 2015-02-25 2016-08-31 Robert Bosch GmbH Pump, in particular high-pressure fuel pump

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101438089A (en) * 2006-03-31 2009-05-20 住友金属工业株式会社 Tubular threaded joint
JP2010121452A (en) * 2008-11-17 2010-06-03 Bosch Corp Fuel supply pump
CN103097715A (en) * 2011-09-06 2013-05-08 丰田自动车株式会社 Fuel pump, and fuel supply system for internal combustion engine
CN105593510A (en) * 2013-07-26 2016-05-18 德尔福国际运营卢森堡有限公司 High pressure pump
WO2015039960A1 (en) * 2013-09-19 2015-03-26 Robert Bosch Gmbh Electromagnetically actuated suction valve
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EP3061967A1 (en) * 2015-02-25 2016-08-31 Robert Bosch GmbH Pump, in particular high-pressure fuel pump

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